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With only a 4" rise you have a slight slope or pitch of 0.2
reference > http://www.pole-barn.info/roof-pitch.html
Can see a good visual and the angle 0.95° here as well > http://www.blocklayer.com/pitchangle.aspx
Have a look and let me know if that helps you out, thanks.
That means for every 1 foot of run the roof drop by .2 tens of an inch??? .2 x 20 =4.0, What angle does this equate to? Try using 22 feeT 2 inches as my previous measures were just approximations not exact.
Bill with 20' and 4" rise have 0.2 pitch which comes to angle 0.95°... by extending the distance to 22'-2" with the 4" rise the pitch is dropped to 0.18 and angle to 0.86°
That is the slope of the roof. Much steeper slope on the attached room where rain runs off onto the garage
Even the gradual slope should allow the water to run off, just not at as fast rate then the steeper additional.
If considering reworking the existing for better drainage, can possibly overlay a new higher pitch roof panels over the existing space.
See > http://www.vpmetalroof.com/replacement-roofs/retrofitting-over-flat-roofs.html
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When put the 4x8 plywood 5/8 the sheets on the roof can I lay them but to but. I'll rate you later
Do I need 1/8th space for the roof 4x8 sheets of plywood on the roof?
Hi Bill sorry for the delay been having some site issues today... Yes can lay new 4x8 sheeting and use 16d nails between the seems to leave 1/8" gap between the joints for any expansion.
Do you see any good advantage appling rubber self stick 4 inch tape all over the seams before going ahead with the roll rubber roofing adhesive applied?Would this be over -kill
pl;ease reply soon
If were using only tar paper then the tape would help ensure a good seal along the plywood seams. . . Since using a rubberized underlayment then do not need to apply any tape on seams.
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